The chemical element of atomic number 86, a rare radioactive gas belonging to the noble gas series.
- ‘That is roughly half the annual dose from inhaled radon and its decay products in a typical single family home in the United States.’
- ‘A review of over 11 studies in uranium miners attributed an observed increase in lung cancer to radon and its progeny and not to uranium.’
- ‘All the areas had previously been thought to be safe from high levels of seeping radon, which comes out of the ground and gathers in enclosed spaces.’
- ‘As the pressure in a building is slightly lower than the pressure outdoors, radon will be drawn from the ground into the building.’
- ‘The ground in some parts of the country releases radon, a radioactive gas that can cause cancer.’
Early 20th century: from radium, on the pattern of argon.
We take a look at several popular, though confusing, punctuation marks.